Lotus Evora. Manual - part 56

 

 

Lotus Service Notes   

 

 

    Section LN

LN.6 - FUEL SUPPLY TEST

To Test Fuel Pump Output

Fuel pressure is controlled by the fuel pump and pressure regulator valve.  Delivery may be checked at 

the connection to the fuel rail after de-pressurising the system and using a proprietary fuel pressure gauge.

The procedure for testing fuel pressure, set by the pressure regulator valve on the end of the fuel rail, 

is detailed in section Em.  Base fuel pressure is 3.0 bar.  If the result of this test is satisfactory, the fuel pump 

delivery quantity may be checked as follows:

WARNING:  Take all necessary precautions to guard against fire and explosion risk when dealing with 

fuel and fuel vapour.  

1.  Disconnect the fuel rail return line (e.g. at quick fit connector), and arrange for collection of return fuel into 

a suitable container.

2.  Arrange for an auxiliary 12 volt feed to the fuel pump to allow continuous operation.

3.  Run the pump for one minute and measure the fuel quantity delivered.

 

Specification = 2.0 - 2.8 litres.

 

If below specification, check the fuel filter for restriction before replacing the fuel pump.

To Remove Pump/Sender Assembly

1.   Remove the fuel tank (see sub-section LN.4).

2.  Release the circlip securing the pump assembly into the tank top flange, noting that the unit is lightly spring 

loaded, and withdraw the unit and sealing ‘O’ ring.  Take suitable precautions to catch any dripping fuel.  

Cap the tank aperture to prevent dirt ingress and to reduce the fume hazard.

3.  To release the fuel gauge sender unit, unclip the black foot from the base of the canister, and disengage 

 

the sender mounting bracket from the canister.  Disconnect the electrical cables from the unit and withdraw.  

Take care not to damage the float arm.

4.  For access to the pump, depress the three retaining barbs, and withdraw the reservoir canister from the 

pump assembly.  Unplug the pump electrical connector, and pull the pump from its outlet spigot.

5.  Thoroughly clean the fuel inlet strainer socks on the pump and canister before refitting.

Re-fitting Pump/Sender Assembly

Fit the pump assembly into the tank aperture using a new ‘O’ ring, and locate the positional tab on the 

pump top plate in the tank flange slot.  Retain with the circlip.  Refit the fuel tank and ‘shear’ panel.

LN.7 - CHARCOAL CANISTER

In order to prevent fuel vapour venting from the fuel tank to atmosphere, the breather pipe from the tank 

is routed to a canister filled with activated-charcoal, which absorbs and stores the fuel vapour when the engine 

is stopped.  When the engine is running, the canister is connected to the depression in the intake plenum such 

that fresh air is drawn through the canister to purge the charcoal of its absorbed fuel, with the resultant gas 

then consumed by the engine in the normal combustion process. 

Charcoal Canister

This is mounted on the bulkhead at the left hand front of the engine bay, oriented horizontally with its 

base to the left, located in a socket bracket, and its top, which houses the three pipework connections, to the 

right and secured to another bracket by a single m6 screw.  Access to the unit is available after removal of the 

airbox intake trunking.

The right hand end of the bed is ventilated via the lowermost port marked 'AIR', to which is attached a 

length of rubber hose routed down the front of the engine bay.  The breather pipe from the fuel tank uses a 

 

 

Lotus Service Notes   

 

 

    Section LN

press button quickfit connector to join to the mid-positioned spigot on the canister marked 'TANK', within which 

the port is extended to the far end of the charcoal bed.  In this way, vapour from the fuel tank is cleansed of fuel 

by the charcoal bed before being vented.

A second quickfit type connector is used on the purge pipe spigot positioned uppermost and marked 

'PURGE', and which also communicates with the left hand end of the bed.  The external pipe from this port 

incorporates a service test connector before joining the purge solenoid valve mounted on the rear end of the 

LH camshaft cover.  The outlet pipe from this valve connects to the engine intake plenum just downstream of 

the throttle valve.  The solenoid valve is opened during certain engine running conditions in order to allow in-

take depression to draw fresh air through the vent pipe and charcoal bed, cleansing the charcoal of fuel before 

consuming the resultant vapour in the normal combustion process.  In this way, the charcoal is prepared for 

further vapour absorption when the engine is stopped.  

Control System

The canister purge valve is controlled by the engine management ECU, which keeps the valve closed 

(unenergised) when the engine is cold or idling in order to protect the catalyst and maintain idle quality.  At 

normal running temperatures and engine speeds above idle, the ECU monitors other parameters and sensor 

data and when appropriate conditions pertain, the ECU will apply a duty cycle to the valve in order to regulate 

the amount of purging allowed, so as not to corrupt the smooth running of the engine.

 

 

Lotus Service Notes   

 

 

    Section MR

ELECTRICS

SECTION MR

                                                   Sub-Section    Page

      PFK 457 Vehicle Security Alarm                         MR.1      2

      Central Door Locking                                MR.2      6

      Electric Windows                                  MR.3      7

      Door Mirrors                                     MR.4      8

      Switches & Instruments - Driver's Information                MR.5      10

      Component Location & Fuse Ratings                      MR.6      23

      Audio Equipment                                  MR.7      27

      Battery, Battery Cables & Earthing Points                   MR.8      28

      Wiper Mechanism                                  MR.9      29

      Harness Routing                                  MR.10    30

      Headlamp Assemblies                               MR.11    31

      Bulb Replacement                                 MR.12    32

      Instrument Panel                                  MR.13    33

      Circuit Diagrams                                  MR.14    34

     

 

 

Lotus Service Notes   

 

 

    Section MR

MR.1 - PFK 457 VEHICLE SECURITY ALARM

Keys

A mechanical key is used to operate the combined ignition switch/steering column lock, and the emergency 

manual door locking function via the left hand door.  The keyhead incorporates three push buttons by which to 

operate the electronic immobiliser, alarm system and central door locking.

A duplicate key is supplied with the new car and, on receipt, should be separated and kept in a safe place 

for use in an emergency.  The mechanical key code and security system PIN (sPecific Identification Number) 

are also supplied with the keys, and should be removed from the key ring by the owner, and noted safely with 

the vehicle documents.  These numbers should also be recorded by the selling dealer and kept securely with 

the vehicle file in the interests of customer service.  The codes will be required when ordering or programming 

replacement or additional keys, and the PIN will allow the security system to be overridden in case of transmit-

ter loss or failure (see later). 

Vehicle Security Alarm

The Lotus Evora is fitted as standard with a PFK 457 immobiliser/alarm which includes the following 

features:

•

U.K. approval to Thatcham category 1.

•

‘Dynamic coding’ of the transmitter keys; Each time the transmitters are used, the encrypted rolling code

is changed to guard against unauthorised code capture.

•

Passive activation of immobiliser, central locking and alarm system.

•

Ingress protection using sensing switches on the latches of both doors, and the tailgate.

•

Selectable cockpit intrusion detection using a microwave sensor.

•

Self powered siren to maintain protection if the vehicle battery is disconnected.

•

Personal protection by ‘on demand’ activation of the siren.

•

Emergency alarm override and transmitter key programming using an alarm sPecific Identification Number

(PIN).

•

Homesafe and selectable dynamic (drive away) locking.

Transmitter Keys

Two transmitter keys are provided with 

the car, and combine a mechanical key blade 

with  a  three  button  transmitter  unit  incorpo-

rated  into  the  key  head.    The  mechanical 

key operates the ignition switch/steering lock 

and  emergency  manual  door  locking.   The 

transmitter operates the central locking, alarm 

system and electronic immobiliser.  The 4-digit 

code for the mechanical key, the unique se-

rial number of the immobiliser/alarm, and the 

system’s 5-digit sPecifc Identification Number

(PIN), are supplied on plastic tags attached to 

the key ring of a new vehicle.  

Disarming the Alarm/Unlocking 

When approaching the car, it is likely that the vehicle is locked and the alarm armed, as indicated by 

the alarm red tell tale lamp in the speedometer face flashing once every 3 seconds.  To disarm the alarm and 

unlock the doors:

-

Press the central, unlock, button on the transmitter key. The first press will unlock the driver’s door, and

a second press, the passenger’s door.

- 

This command will be acknowledged by a double flash of the hazard lamps.

- 

The alarm tell tale will be extinguished.

-

The interior and mood lights will fade on, and remain lit for up to 2 minutes (if set to the ‘courtesy’ posi-

tion).

- 

The engine will be mobilised (see below).

 

Manual siren, tailgate

  Disarm, mobilise, unlock

  Arm & Lock 

       

   

  TRANSMITTER KEY                 

ohs128d